1. PART 2

2. 25.3.2 AdRotator Control AdRotator control
Randomly selects an image to display
Generates a hyperlink to the Web page associated with that image
Browsers that do not support images display alternate text that is specified in the XML document
The browser loads the Web page associated with that image when a user clicks the image or substituted text

3. 25.3.2 AdRotator Control (Cont.)
Accesses an XML file to determine what advertisement image, hyperlink URL and alternate text to display and include in the page
Create an XmlDataSource control to connect to the XML file
ImageUrl Element
Specifies the path (location) of the advertisement’s image
NavigateUrl Element
Specifies the URL for the Web page that loads when a user clicks the advertisement
The URL cannot contain any whitespace
AlternateText Element
Contains text that displays in place of the image when the browser cannot locate or render the image
Also a tooltip
Impressions Element
Specifies how often a particular image appears, relative to the other images

4. Defines an AdRotator control
Outline
FlagRotator.aspx
(1 of 2)
Defines an AdRotator control
Defines an XmlDataSource control, which supplies the data to the AdRotator control

5. Outline
FlagRotator.aspx
(2 of 2)

6. Outline
AdRotatorInforma tion.xml
(1 of 4)
Each Ad element represents an advertisement that will be displayed by the AdRotator control
Specifies the path of the advertisement’s image
Specifies the URL for the Web page that loads when user clicks on the advertisement
Text that displays in place of the image when the browser cannot render the image
Specifies how often a particular image appears

7. Outline
AdRotatorInforma tion.xml
(2 of 4)

8. Outline
AdRotatorInforma tion.xml
(3 of 4)

9. Outline
AdRotatorInforma tion.xml
(4 of 4)

10. 25.3.3 Validation Controls Validation Control
Determines whether the data in another Web control is in the proper format
Provide a mechanism for validating user input on the client
The validator is converted into JavaScript when the XHTML for the page is created
Java Script is a scripting language that enhances the functionality and appearance of Web pages
For security reasons, validation is always performed on the server

11. 25.3.3 Validation Controls (Cont.)
RequiredFieldValidator
ControlToValidate property
Indicates Validator verifies a control’s contents
ErrorMessage Property
Text displayed if the validation fails
Display property
Determines if the validator is displayed only when validation fails
RegularExpressionValidator
Matches a Web control’s content against a regular expression
That expression is assigned to ValidationExpression property
IsPostBack property
Determines whether the page is being loaded due to a postback
The current page reloads when the user submits the form

12. Outline
Validation.aspx
(1 of 5)
Defines a RequiredFieldValidator which confirms the TextBox is not empty

13. Outline
Defines a RequiredFieldValidator which confirms the TextBox is not empty
Validation.aspx
(2 of 5)
Defines a RegularExpressionValidator control to determine whether data is entered in a valid format

14. Defines a RequiredFieldValidator which confirms the TextBox is not empty
Outline
Validation.aspx
(3 of 5)
Defines a RegularExpressionValidator control to determine whether data is entered in a valid format

15. Outline
Validation.aspx
(4 of 5)

16. Outline
Validation.aspx
(5 of 5)

17. Outline Determines whether the page is being loaded due to a postback
Validation.aspx .vb
Determines whether the page is being loaded due to a postback
Retrieves the values of the TextBoxes